11
ADJUSTMENT OF LIMIT SWITCHES
This unit is provided with ACCU-CAM ® for precise and quick one-handed adjustment feature.
Figure 12
Adjusting the limit cams
4.4 MINIMUM SUGGESTED WIRE SIZE FOR CONTROL CIRCUIT
The control circuit operates at 24 VAC. Due to the resistance in the wire used to carry the control circuit voltage,
it is important to use the appropriate wire size with respect to the distance between the operator and the push-
button station.
Below is a chart (TABLE 2) indicating the minimum recommended wire size with respect to the total
distance between the operator and the push-button station. DO NOT exceed the maximum distance. If
there are several push-button stations in series you must ADD all these distances before selecting the
appropriate wire gauge for your operator.
If the wire gauge is not suitable for the distance, problems in operation will be encountered such as chattering
relays and contactor, premature wear of the contacts and possible tripping of the motor's thermal protection.
If a greater distance is required, a long distance interface module is suggested (consult factory).
When large gauge wire is used, a separate junction box will be needed for operator power connection (not
supplied).
All power wiring to the operator should be installed by a qualified electrician and may vary with respect to
conduit size and type as specified in the National Electrical Code, Article 430, allowing 5% voltage drop. Power
must also be connected in accordance with local codes.
TABLE 2 WIRE SIZE vs. DISTANCE
24 VAC
CONTROL WIRING
Minimum suggested
Wire gauge
(AWG)
Maximum distance between operator and all
Push-button stations
feet (meters)
22 50
(15)
20 100
(30)
18 150
(45)
16 250
(75)
14 350
(105)
12 450
(135)
Pull the traveling cam retaining bracket
on desired side
to adjust cam position
